The 777 is produced in two fuselage lengths as of 2018. The extended-range 777-300ER and ultra long-range 777-200LR variants entered service in 2004 and 2006 respectively, while the 777F, a freighter version, debuted in February 2009; these second-generation variants all feature high-output GE90 engines and extended raked wingtips.

Virgin Australia Boeing B777-300 ER (“ER” for Extended Range) is the B-market version of the -300. Its higher MTOW and increased fuel capacity permits a maximum range of 7,370 nautical miles (13,650 km) with 396 passengers in a two-class seating arrangement.[160] The 777-300ER features raked and extended wingtips, a strengthened fuselage and wings and a modified main landing gear. Its wings have an aspect ratio of 9.0. It is powered by the GE90-115B turbofan, the world’s most powerful jet engine with a maximum thrust of 115,300 lbf (513 kN). Following flight testing, aerodynamic refinements have reduced fuel burn by an additional 1.4%.

The first -300ER was delivered to Air France on April 29, 2004.[183] The -300ER is the best-selling 777 variant, having surpassed the -200ER in orders in 2010 and deliveries in 2013. As of June 2018, -300ER deliveries to 45 different customers totalled 789, with 48 unfilled orders. As of July 2017, 739 Boeing 777-300ER aircraft were in service.